STV9 380A
Class-D Vertical Deflection Amplifier for 2.5 Amp TV and Monitor Applications
Main Features
s High-Efficiency Power Amplifier s No Heatsink s Split Supply s Internal Flyback Generator s Output Current up to 2.5 APP s Suitable for DC Coupling Applications s Few External Components s Protection against Low VCC
PDIP 20 Order Code: STV9380A
- V CC
1 2 3 4 5 6
20 19 18 17 16 15 14 13 12 11
- V CC - V CC - V CC -VCC POW + VCC POW +VCC E A out IN+ INS G ND
Description
Designed for TV and monitor applications, the STV9380A is a Class-D vertical deflection booster assembled in a 20-pin plastic DIP package. It operates with supplies up to 18 V and provides an output current up to 2.5 APP to drive the yoke. The internal flyback generator avoids the need for an extra power supply.
- V CC - V CC OU T CFLY + CFLY B O OT V RE G FEEDCAP FREQ
7
8 9 10
October 2003
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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Pin Functions
STV9380A
1
Pin Functions
Table 1: STV9380A Pin Descriptions
Pin
1 2 3 4 5 6 7 8 9 10
N am e
-VCC -VCC -VCC OU T CFLY+ CFLYB OOT VR E G FEEDCAP FREQ
Function
Negative Supply Negative Supply Negative Supply PWM Output Flyback Capacitor Flyback Capacitor Bootstrap Capacitor Internal Voltage Regulator Feed-back Integrating Capacitor Frequency Setting Resistor
Pin
11 12 13 14 15 16 17 18 19 20
N am e
S GN D INI N+ EA out +VCC +VCCPOW -VccPOW -VCC -VCC -VCC
Function
Signal Ground Error Amplifier Inverting Input Error Amplifier Non-inverting Input Error Amplifier Output Positive Supply Positive Power Supply Negative Power Supply Negative Supply Negative Supply Negative Supply
Note 1. The voltage reference, accessible on pin 8, is for internal use only. No additional components should be connected to this pin except the decoupling capacitor.
2
Functional Description
The STV9380A is a vertical deflection circuit operating in Class D. Class D is a modulation method where the output transistors work in switching mode at high frequency. The output signal is restored by filtering the output square wave with an external LC filter. The major interest of this IC is the comparatively low power dissipation in regards to traditional amplifiers operating in class AB, eliminating the need of an heatsink. Except for the output stage which uses Class D modulation, the circuit operation is similar to the one of a traditional linear vertical amplifier. A (sawtooth) reference signal has to be applied to the circuit which can accept a differential or single ended signal. This sawtooth is amplified and applied as a current to the deflection yoke. This current is measured by means of a low value resistor. The resulting voltage is used as a feedback signal to guarantee the conformity of the yoke current with the reference input signal. The overvoltage necessary for a fast retrace is obtained with a chemical capacitor charged at the power supply voltage of the circuit. At the flyback moment, this capacitor is connected in series with the output stage power supply. This method, used for several years with the linear vertical boosters and called "internal flyback" or "flyback generator", avoids the need of an additional power supply, while reducing the flyback duration. The circuit uses a BCD process that combines Bipolar, CMOS and DMOS devices. The output stage is composed of low-R ON N-channel DMOS transistors.
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STV9380A
+ V CC
100n F
1 00nF +V C C -VCC 16
100 0 F +V CC power SSTV9380A TV9 3 0A
15
VREG -V CC 100n F 8 VREF Flyback Detection Flyback Generator 5 6 CFLY+ Figure 1: Test and Application Circuit Diagram CFLYBACK 100 F
CFLYBOOT
IN+ 13 1 k Input Signal IN 12 EA out 14 10k 1k 11 SGND FEEDCAP 470pF 4.7nF 10k 100 nF 9 Pins 1, 2, 3, 18, 19 and 20 10 FREQ -V CC 17 + _ Modulator Output Drive
7 O UT 4 150
C boot 2 20nF 1m H 470 nF 150 Deflect. Yoke* 200
560pF -VCC power 1000 F S ens e Resistor 0.5
Functional Description
-V CC * Deflection yoke characteristics: R = 5.5, L = 7mH fVERT = 50 Hz 3/10
Absolute Maximum Ratings
Figure 2: Thermal Resistance with "On-board" Square Heatsink vs. Copper Area
STV9380A
RthJA (C /W)
Co pper Area 35 m Thickness
70
60
PC Board
50
40 0 4 8 12 Area (cm²)
3
Absolute Maximum Ratings
P a ra m e t e r
DC Supply Voltage Storage and Junction Temperature O perating Temperature Range ESD Susceptibility - Human Body Model (100 pF discharge through 1.5 k) O utput current M axim um output voltage (pin 4) with respect to -Vcc (pins 1, 2, 3, 18, 19 and 20) and during flyback (see Note 1)
Symbol
VCC TSTG, TJ TOP VESD IOUT VOUT
Value
20 -40 to +150 -20 to +70 2 1.6 80
Unit
V C C kV A V
Note 1. During the flyback with VCC = 18 V, the maximum output voltage (pin 4) is close to 72 V, with respect to -VCC (pins 1, 2, 3, 18, 19 and 20).
4
Thermal Data
P a ra m e t e r
Junction-to-Ambient Thermal Resistance
Symbol
RthJA
Value
70
Unit
C / W
Pins 1, 2, 3, 18, 19 and 20 are internally connected together and participate in heat evacuation.
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STV9380A
Electrical Characteristics
5
Electrical Characteristics
TAMB = 25 C, VCC = 12 V and fVERT = 50 Hz unless otherwise specified (refer to Figure 1)
Sym bol
+VCC -VCC VCC VCCSTART IQ IY I13, I12 VOS SVR FlyTHR FlyTHF PD fSW fSW-OP RFREQ
Parameter
Positive Supply Range Negative Supply Range Maximum recommended difference between +V CC and |-VCC| Low VCC Detection Quiescent Supply Current Maximum Vertical Yoke Current Amplifier Input Bias Current Output Offset Voltage Supply Voltage Rejection Flyback Detection Threshold (Positive Slope) Flyback Detection Threshold (Negative Slope) Integrated Circuit Dissipated Power Switching Frequency Switching Frequency Operative Range Frequency Controller Resistor Range
Test Conditions
Min.
+10 - 18
Typ.
Max.
+18 -10 4
Units
V V V V mA
6.5 Input Voltage = 0 14 1.25 -0.1 Note 1 Note 2 V(14) V(14) Note 3 RFREQ = 10 k 120 100 Pin 10 7 10 - 50 82 1.5 0.5 1.1 140 160 200 14 +50
A
A
mV dB V V W kHz kHz k
Note 1. Input voltage = 0, measured after the filter (e.g. across the 470 nF filter capacitor) 2. Supply rejection of the positive or negative power supply. VCC ripple =1 VPP , f =100 Hz, measured on the sense resistor. 3. Power dissipated in the circuit in the case of the application from Figure 1 and the current in the deflection yoke adjusted to 2.5 APP. The corresponding power dissipated in the vertical deflection yoke is 2.8 W.
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I/O Waveforms
STV9380A
6
I/O Waveforms
The following waveforms are obtained with the schematic diagram given in Figure 1: Test and Application Circuit Diagram.
Figure 3: Current in the Deflection Yoke (Calibration: 0.5 A/div.)
Figure 4: Current and Voltage in the Deflection Yoke during Flyback (Calibration: 0.5A/div, 10 V/div)
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STV9380A
I/O Waveforms
Figure 5: Current in the Deflection Yoke and Voltage at the Error Amplifier Output (pin 14 - STV9380A) during Flyback (Calibration: 0.5 A/div, 1 V/div)
Figure 6: Current in the Deflection Yoke and Voltage at the Output of the STV9380A (pin 4), during the Flyback (Calibration: 0.5 A/div, 10 V/div)
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Package Mechanical Data
STV9380A
7
Package Mechanical Data
Figure 7: 20-Pin Plastic Dual In-Line Package, 300-mil Width
K1 K2 A2 A
e4
G A1 S b2 e3 D b e L C E1 e1
Table 2: DIP20 Package mm Dim. Min.
A A1 A2 b b2 c D e E1 L 6.10 2.92 0.38 2.92 0.36 1.14 0.20 24.89 2.54 6.35 3.30 7.11 3.81 0.240 0.115 3.30 0.46 1.52 0.25 4.95 0.56 1.78 0.36 26.92
inches Max.
5.33 0.015 0.115 0.014 0.045 0.008 0.980 0.100 0.250 0.130 0.280 0.150 0.130 0.018 0.060 0.010 0.195 0.022 0.070 0.014 1.060
Typ.
Min.
Typ.
M ax.
0.210
Number of Pins N 20
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STV9380A
Package Mechanical Data
Figure 8: ESD Protection Structure
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Revision History
STV9380A
8
Revision History
Table 3: Summary of Modifications Version
1. 0
Date
May 2003 First Issue
Description
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan M alaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. www.st.com
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